What's new

DSP-A1 no subwoofer sound, help? (1 Viewer)

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
I inherited a home system with a Velodyne SPL1200 subwoofer and a DSP-A1 receiver. There was a monster cable that was frayed at both ends (indicative of shield dmg?) which was used as the mono sub-out connector from the receiver to the (powered) sub.The monster cable pulled out the female RCA jack metal piece from the receiver unit.Using the frayed cord, the sub produces a hum (that sounds like a ground loop issue). This happened at all times that the frayed cord was plugged into the sub, whether it also was plugged into the receiver, whether it was using a Y-connector on the sub (for the LFE + input) or not.I wiggled the connection of the frayed monster cable at the sub connection and at one point I got it to go away, but then it came back. Jiggling would lessen the intensity of the hum.My diagnosis is that the cord shield was broken and not allowing the sub's ground-claim to sync up with the sub's own ground. It wasn't due to units being plugged in wrong - the sub + receiver are 2-prong and in the same outlet (and tried others and combinations to no avail).I replaced the monster cable with a 13$ walmart subwoofer cable and the hum is gone (presumably from a cable with an unbroken shield that allows for a proper ground). The hum is gone.There was no sound before, but there is still no sound. This is my first home entertainment system I'm setting up, so I may have looked over something.Other speakers work fine.The sub is hooked up to the Mono rca out from the receiver, and the sub-end connection comes to a Y-connector with the original lead going to the "right-red" input, and the other end of the Y going into the "white-left" (or just plainly LFE) input.The connector at the receiver had pulled out at one point as I mentioned. I put the female part which had pulled out back inside the port. The female metal part which pulled out looks like a small metal sleeve with 2 flat rounded prongs with teeth sticking off of it, to be clear.I need advice on what to do. Why is there no sound to the sub?? Can I test the sub port with a multimeter to see if there's anything working or if it's a dead port? Can I fix the dead port myself with basic electronic soldering? I really need a miracle. I inherited a ~10 grand system with this ONE defect and I'm dead set on fixing it. What is it without a subwoofer right?
 

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
Hey - I'm looking for the part of page 27 which is pertinent to me? I've read over that page and I'm not retaining anything important regarding turning on/off a sub-output. Is that even a thing? Sorry for my naivete.
 

Phil A

Senior HTF Member
Joined
Oct 1, 2000
Messages
3,249
Location
Central FL
Real Name
Phil
The part where it has '1 D' about the LFE out and you have choices for what is selected.
 

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
oh yes when i selext subwoofer i dont get any bass out of the sub. i thought it could be from not using low enough frequencies.
 

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
could the mono sub rca jack having its metal collar pop out only to be stuck back inside have caused more serious damage?
 

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
The only options I saw from 1D were that there are 3 options, ALTHOUGH YES, there exists more than one location for a sub-out. The three options are "SW" (subwoofer), "MAIN", and "BOTH". I haven't come across any option for turning the sub-out field from "Mono" to "Split" or any other offered outputs. Maybe I haven't looked hard enough, but I've tried quite a bit.
 

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
Sorry schan, please excuse my naivete with regards to audio equipment. Like I said, I really don't know what I'm talking about when it comes to working knowledge on this subject. I'll need to read up on "pulling main jumpers" and adding a crossover. It's just foreign jargon to me at this precise moment. Of course I have electrical device knowledge basics and I'll figure it out. However - I think I may have had a setting on the wrong configuration.

I believe that the reason may be because I had the speakers configured to be "LARGE" speakers, which apparently may turn off the low frequency sounds to the sub and direct them only to the subwoofer - EVEN IF THE LFE/SUB OUTPUT is set to "BOTH" or even "SW". I'll confirm when I'm home today.
 

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
haha sorry. just got a corporate job "bonus" and am graduating to the big boys with this. young man here, again, thanks for holding my hand. great community.
 

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
so ive changed the speakers to small, but I'm not getting any noise at all out of the sub. I reiterate, there was a hum because of a broken cord that had a disconnected shielding causing a hum similar to a ground loop hum for the same reasons.

I just replaced the RCA, and the speaker modes are all set to small, and the LFE/SUB OUT is set to SW ONLY. Any clues guys?
 

erikweber321

Auditioning
Joined
Sep 1, 2014
Messages
9
Real Name
erik
I want to say that I've now successfully activated the sub. The small speaker settings weren't the only thing I needed. After fiddling with different effect types, I realized I had it on one that had all but muted the sub. After cranking the sub I realized that it finally was active and now I've learned a few lessons. Thanks a million for helping pick my brain over these settings because it just wasn't making sense to me.

THanks again
 

Users who are viewing this thread

Forum statistics

Threads
356,710
Messages
5,121,133
Members
144,146
Latest member
SaladinNagasawa
Recent bookmarks
0
Top